If you’ve never baked with rhubarb before, you’re going to love how sweet and tart it is. This Rhubarb Dump Cake Recipe is one of those easy desserts that almost bake themselves. You don’t need a mixing bowl or any stress; just layers of simple goodness that turn golden and bubbly in the oven.
When I first made this recipe, I couldn’t believe how easy it was to turn a few pieces of sour rhubarb into a warm, jammy filling that tastes like sunshine in a pan. The buttery cake topping crisps up just right, giving us all the satisfaction of being able to spoon through the crust.
It has that old-fashioned comfort that makes you think of family picnics and cozy weekends. Serve it warm with a scoop of vanilla ice cream or chilled with whipped cream for a lighter twist. If you like simple old-fashioned desserts, you’ll love our Pineapple Bread Recipe or fruity classics like the Lemon Dump Cake Recipe.
Believe me, this rhubarb dump cake will become one of your “lazy-day favorites” for good.
Sweet, tangy, and perfectly nostalgic this Rhubarb Dump Cake Recipe is pure comfort in every bite.
No mixer, no hassle just layer, bake, and watch the magic happen.
The rhubarb melts into a jammy base while the cake turns golden and crisp.
Serve it warm with ice cream or cold with whipped cream both taste heavenly!
One spoonful, and you’ll understand why this easy dessert is a timeless favorite. 🍰
Rhubarb Dump Cake Recipe
Equipment
- 9×13-inch baking dish
- Mixing spoon or spatula
- Measuring cups and spoons
- Small saucepan (for melting butter)
- Oven mitts (it gets golden hot 🔥)
Ingredients
- 4 cups rhubarb chopped (fresh or frozen, no need to thaw)
- 1 cup granulated sugar adjust to taste if your rhubarb is sweet
- 1 package yellow cake mix 15.25 oz
- 1 cup water or use apple juice for a fruity touch
- ½ cup unsalted butter melted
- 1 teaspoon vanilla extract optional but adds depth
- Pinch of salt to balance sweetness
- Toppings optional: vanilla ice cream, whipped cream, or a sprinkle of cinnamon sugar
Instructions
- Preheat the oven to 350°F (175°C). Lightly grease a 9×13 inch baking dish.
- Add rhubarb and sugar. Spread the chopped rhubarb evenly on the bottom of the dish and sprinkle sugar on top.
- Add cake mix. Pour the dry cake mix evenly over the rhubarb and sugar layer — do not stir.
- Add liquid and butter. Pour the water (evenly distributed) over the top, then drizzle the melted butter across the entire surface.
- Bake for 45 to 50 minutes. The top should be golden brown and crispy around the edges.
- Cool slightly before serving. Enjoy warm or chilled either way, it melts in your mouth.
Notes
Share Your Twist on This Rhubarb Dump Cake Recipe!
Did you add strawberries or make it extra tart with lemon juice? 🍓🍋
Maybe you swapped the cake mix for white or spice cake for a cozy twist?
We’d love to see how you made this easy dessert your own!
📸 Snap a picture of your beautiful bake and tag #OoohDelishTwist on Instagram or Facebook your version might inspire someone’s next sweet creation.
💌 Have a creative version? Send it to contact@ooohdelish.com your dessert could be featured in our next Oooh Delish Vintage Comfort Desserts Collection!
FAQs: Rhubarb Dump Cake Recipe
Rhubarb Dump Cake Recipe FAQ
Can I use frozen rhubarb?
Yes. Add it directly from frozen to the baking dish. No thawing needed and the bake time remains similar.
Can I make it without boxed cake mix?
Yes. Combine 1.5 cups all purpose flour, 1 cup sugar, 2 teaspoons baking powder, and a pinch of salt. Sprinkle evenly in place of the boxed mix.
How sweet should I make the rhubarb layer?
Start with 1 cup sugar for 4 cups rhubarb. If your rhubarb is very tart, increase slightly. If adding berries, you can reduce a bit.
What should I serve with it?
Vanilla ice cream or lightly sweetened whipped cream are classic. For a fresh pairing, try a cool sip like the Coconut Mojito Recipe.
How do I store leftovers?
Cover and refrigerate for up to 3 days. Reheat gently or enjoy chilled. The topping stays crispest on day one.
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